back in august 2009 his ship was briefly grounded in the sacramento river two days later damaged a dock at the port of stockton. and then in may of 2010, he was supervising a trainee on a tugboat that hit bottom in richmond's harbor. the investigation into what happened here is still under way. >> we're looking at the vessel itself. we'll consider the weather. we'll look at the gps. >> reporter: now, the ship scraped the most eastern tower of the bay bridge's western span about 35 feet of the tower's fender damaged. but there was no oil spill, no injuries. the investigation into what happened continues. we still have not heard back on results from the pilot's drug test. live on treasure island, anne makovec, cbs 5. >>> this morning a reward will be announced for the return of a very valuable artifact stolen from the oakland museum. police say the thief broke in on monday and stole a historic gold box valued over $800,000. oakland police and the mayor jean quan will join museum officials to announce a reward at 9:30 a.m. >> not so much just in its monetary value but it is very rare. it's